migration

a double sulfate analogous to potassium alum, as aluminum ammonium sulfate, with the formula R2SO4?X2(SO4)3?24H2O, where R is alkali metal or ammonium

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World English Dictionary

migration (maɪˈɡreɪʃən)

—n
1.	the act or an instance of migrating
2.	a group of people, birds, etc, migrating in a body
3.	chem a movement of atoms, ions, or molecules, such as the motion of ions in solution under the influence of electric fields

mi'grational

—*adj*

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Etymonline

Word Origin & History

migration

1610s, of persons, 1640s of animals, from L. migrationem (nom. migratio), from pp. stem of migrare "to move from one place to another," probably originally *migwros, from PIE *meigw- (cf. Gk. ameibein "to change"), from base *mei- "to change, go, move" (see mutable). That

European birds migrate across the seas or to Asia was understood in the Middle Ages, but subsequently forgotten. Dr. Johnson held that swallows slept all winter in the beds of rivers, while the naturalist Morton (1703) stated that they migrated to the moon.

Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage

Medical Dictionary

migration mi·gra·tion (mī-grā'shən)
n.

The moving from place to place, as of disease symptoms.
See diapedesis.
The movement of a tooth or teeth out of normal position.
The movement of one or more atoms from one position to another within a molecule.
The movement of ions between electrodes during electrolysis.

American Heritage

Science Dictionary

migration

(mī-grā'shən) Pronunciation Key

The seasonal movement of a complete population of animals from one area to another. Migration is usually a response to changes in temperature, food supply, or the amount of daylight, and is often undertaken for the purpose of breeding. mammals, insects, fish, and birds all migrate. The precise mechanism of navigation during migration is not fully understood, although for birds it is believed that sharp eyesight, sensibility to the Earth's magnetic field, and the positions of the Sun and other stars may play a role.
The movement of one atom or more, or of a double bond, from one position to another within a molecule.
The movement of ions between electrodes during electrolysis.

Example sentences

The mechanical cotton picker spurred a migration to northern cities-and the

civil rights movement.

The big schools had not arrived yet, no doubt because warm water forestalled

their migration from the north.

Only elephants can pull off an authentic migration of elephants.

It doesn't necessarily tells us the historical sequence of admixture events or

the direction of migration.

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Matching Quote

"Electronic aids, particularly domestic computers, will help the inner migration, the opting out of reality. Reality is no longer going to be the stuff out there, but the stuff inside your head. It's going to be commercial and nasty at the same time."

-J.G. Ballard